<template>
  <section class="todoapp">
    <todo-header :list="list" @addTask="addTaskHandler"></todo-header>
    <todo-main @delTask="delTaskHandler" :list="showList"></todo-main>
    <todo-footer
      @clearDone="clearDoneHandler"
      @changeTask="changeTaskHandler"
      :list="showList"
    ></todo-footer>
  </section>
</template>

<script>
// 导入组件
import TodoHeader from "./components/Todoheader.vue";
import TodoMain from "./components/TodoMain.vue";
import TodoFooter from "./components/TodoFooter.vue";

export default {
  components: {
    TodoHeader,
    TodoMain,
    TodoFooter,
  },
  data() {
    return {
      list: JSON.parse(localStorage.getItem("list") || "[]"),
      isSel: "all",
    };
  },
  methods: {
    addTaskHandler(taskName) {
      let id =
        this.list.length === 0 ? 100 : this.list[this.list.length - 1].id + 1;
      this.list.push({
        id,
        name: taskName,
        isDone: false,
      });
    },
    delTaskHandler(id) {
      let index = this.list.findIndex((item) => {
        return (item.id = id);
      });
      this.list.splice(index, 1);
    },
    changeTaskHandler(isSel) {
      // console.log(isSel);
      this.isSel = isSel;
    },
    clearDoneHandler() {
      let arr = this.list.filter((item) => !item.isDone);
      this.list = arr;
    },
  },
  computed: {
    showList() {
      if (this.isSel === "no") {
        return this.list.filter((item) => {
          return !item.isDone;
        });
      } else if (this.isSel === "yes") {
        return this.list.filter((item) => item.isDone);
      } else {
        return this.list;
      }
    },
  },
  watch: {
    list: {
      deep: true,
      handler() {
        localStorage.setItem("list", JSON.stringify(this.list));
      },
    },
  },
};
</script>

<style>
</style>
